"We are fixing our charging points at Chargemaster’s cost and have a very high operational level. Source London has been saying that it’s not their problem, but it jolly well is," said David Martell, boss of Chargemaster.

Arnaud says Source London will address concerns by planning two further stages of repair in autumn and winter, based on the next wave of boroughs expected to sign up to the new maintenance regime later this year.

A new feature will be centralised monitoring of each post, through the Source London control centre, which requires many charging posts to be fitted with a new communications ‘black box’ and involving building works at the road-side.

However, better reliability will come at some cost to EV drivers because later this year Source London plans to introduce parking charges for each bay.

Charges will be scaled according to TfL’s zones 1-6 used to calculate tube and bus fares, although the exact tariff has yet to be revealed.

"It will cost us more in central London than outer London, so we will set our charges accordingly," said Arnaud.

One report suggests a charge of up to £5 an hour in central London, although Source London won’t confirm that number.

The London charging network has faced reliability problems because maintenance was shared between the boroughs and charging point manufacturers, with a budget of just £480 per year per post. This has resulted in very poor reliability, with around one third of the 1400 charger points out of service.

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May i suggest you add the Ecotricity DC (CCS type)fast charge points )mainly located at UK motorway service stations) to your list of charging failures.
I found 4 in a row did not work last weekend on the same stretch of the M4, had i not had a range extender type vehicle i would have been stranded. They had significant government money and patronage to get these prime locations, and yet they cant be relied upon.
The government has failed miserably with electric car charge points, with multiple providers offering a very fragmented and unreliable service. I have 6 payment/access cards and still cant use all of them. Some are located in underground car parks where they cannot connect to their networks and are thus down most of the time! Incompetence is rife and govt subsidy of one sort or another prevents real competition.